ADHESIVE, ADHESIVE SHEET, LAMINATE AND FLEXIBLE DISPLAY

• Main Author: FUKUTA KATSUNORI
• Format: Patent
• Language: English; Japanese
• Published: 26.06.2023
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; DYES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; PAINTS; PERFORMING OPERATIONS; POLISHES; TRANSPORTING; USE OF MATERIALS AS ADHESIVES

To provide an adhesive and an adhesive sheet having excellent transparency and also having heat resistance and moisture heat resistance and capable of achieving both flexibility and windability.SOLUTION: There is provided an adhesive which contains an acrylic copolymer (A) comprising a (meth)acrylic acid alkyl ester monomer having an alkyl group having 1 to 4 carbon atoms, a (meth)acrylic acid alkyl ester monomer having an alkyl group having 6 to 12 carbon atoms, a monomer having a hydroxyl group and a monomer having a carboxy group, a tackifier resin (B) which is a saturated aliphatic hydrocarbon compound having at least one alicyclic structure in the molecule and a curing agent (C). The storage modulus of the adhesive at -20°C, 25°C and 60°C at 1 Hz is 1×105 to 1×106 Pa, 4×104 to 1×105 Pa and 1×104 to 4×104 Pa, respectively. The loss modulus at 1 Hz of the adhesive at -20°C and 60°C is 1.0 to 3.0 and 0.2 to 1.0, respectively.SELECTED DRAWING: Figure 1 【課題】透明性に優れ、さらに耐熱性および耐湿熱性と、屈曲性および巻き取り性の両立が可能な粘着剤および粘着シートの提供。【解決手段】アルキル基の炭素数１～４の（メタ）アクリル酸アルキルエステルモノマー、アルキル基の炭素数６～１２の（メタ）アクリル酸アルキルエステルモノマー、水酸基を有するモノマー、およびカルボキシ基を有するモノマーからなるアクリル系共重合体（Ａ）、分子内に少なくとも一つの脂環構造を有する飽和脂肪族炭化水素化合物である粘着付与樹脂（Ｂ）、および硬化剤（Ｃ）を含む、粘着剤。前記粘着剤の－２０℃、２５℃及び６０℃における、１Ｈｚでの貯蔵弾性率が、それぞれ１×１０５～１×１０６Ｐａ、４×１０４～１×１０５Ｐａ、１×１０４～４×１０４Ｐａである、前記粘着剤。前記粘着剤の－２０℃及び６０℃における、１Ｈｚでの損失係数が、それぞれ、１．０～３．０、０．２～１．０である、前記粘着剤。【選択図】図１